if (document.images) {
image1 = new Image;
image2 = new Image;
image1.src = "images/button1_on.gif";
image2.src = "images/button1_off.gif";

image3 = new Image;
image4 = new Image;
image3.src = "images/button2_on.gif";
image4.src = "images/button2_off.gif";

image5 = new Image;
image6 = new Image;
image5.src = "images/button3_on.gif";
image6.src = "images/button3_off.gif";

image7 = new Image;
image8 = new Image;
image7.src = "images/button4_on.gif";
image8.src = "images/button4_off.gif";

image9 = new Image;
image10 = new Image;
image9.src = "images/button5_on.gif";
image10.src = "images/button5_off.gif";

image11 = new Image;
image12 = new Image;
image11.src = "images/button6_on.gif";
image12.src = "images/button6_off.gif";

image13 = new Image;
image14 = new Image;
image13.src = "images/button7_on.gif";
image14.src = "images/button7_off.gif";

image15 = new Image;
image16 = new Image;
image15.src = "images/button8_on.gif";
image16.src = "images/button8_off.gif";

}


function swapImage(thisImage,newImage) {
if (document.images) {
 document[thisImage].src = eval(newImage + ".src");
}
}